EP1739421A1 - Elektrochemische Analysevorrichtung zur selektiven Messung von Chloriten in Wasser - Google Patents

Elektrochemische Analysevorrichtung zur selektiven Messung von Chloriten in Wasser Download PDF

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Publication number
EP1739421A1
EP1739421A1 EP05425459A EP05425459A EP1739421A1 EP 1739421 A1 EP1739421 A1 EP 1739421A1 EP 05425459 A EP05425459 A EP 05425459A EP 05425459 A EP05425459 A EP 05425459A EP 1739421 A1 EP1739421 A1 EP 1739421A1
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EP
European Patent Office
Prior art keywords
chlorites
water
continuous
electrode
selective analysis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP05425459A
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English (en)
French (fr)
Inventor
Luigi Castioni
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CLR Srl
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CLR Srl
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Filing date
Publication date
Application filed by CLR Srl filed Critical CLR Srl
Priority to EP05425459A priority Critical patent/EP1739421A1/de
Publication of EP1739421A1 publication Critical patent/EP1739421A1/de
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/18—Water
    • G01N33/182—Specific anions in water
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/18—Water
    • G01N33/1893—Water using flow cells
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/29—Chlorine compounds

Definitions

  • Chlorite ion is one of the reaction by products appearing with the use of chlorine dioxide, a substance typically used for the oxidation and disinfection of drinking water, wastewater and industrial water.
  • the Council Directive 98/83/EC of 3 November 1998 concerning the quality of water intended for human consumption and following actuation in different European countries (e.g. D.Lgs.31/2001 for Italy) give a limit for the concentration of chlorites in such waters (200 ⁇ g/L as chlorites). This means that drinking water plants applying chlorine dioxide in one or more stages of their treatment should monitor chlorites concentration at least in the water at the outlet of the plant (water to distribution system).
  • Chlorites in water are always or almost always contemporarily present in the same water with chlorine dioxide: for this reason the analyser for chlorites must be selective to chlorites and insensitive to chlorine dioxide.
  • chlorites will always be associated with the other substances added to the water: the analyser must therefore be insensitive to the interference of all the substances potentially present in the water together with chlorites.
  • the invention subject of this patent concerns an on-line electrochemical analyser for the measure of chlorites in water characterized by high selectivity even in presence of interfering substances normally present with chlorites in drinking water plants and in all those plants where chlorine dioxide or chlorites are used as disinfectants and/or as oxidizing agents.
  • the on-line electrochemical analyser for selective measurements of chlorites object of this patent is composed of:
  • Measuring electrodes are three: working electrode (W), counter electrode (C), and reference electrode, (R), and they are located into the cell as indicated in Fig.1 and in Fig.2. Operating principle for this 3 electrodes potentiostatic measuring system is the following:
  • One of the advantages of this invention is that no reagent addition is required to operate the measurement.
  • Analyzers which require a sample conditioning system are characterized by high operating costs due to reagent consumption (cost of the chemical) and to time waste in preparing the solution and refilling the reservoir.
  • the working electrode (W) and the counter electrode (C) are made of graphite with a special surface treatment designed for minimizing the naturally occurring polarization of the electrodes during they normal operation (this is a common phenomenon that occurs on all measuring electrodes and on all counter electrodes and is intrinsic to the operation of the electrodes themselves).
  • Another function of the surface treatment for the C and W electrodes is to reduce ground noises.
  • Shape and dimensions of the W and C electrodes have been designed for optimizing current density on the reactive surfaces: the current density is high enough for the discharge reaction of chlorite ions, but not so high to allow polarization of the electrodes due to deposit of polarizing film (polarization phenomenon is already minimized by the surface treatment as described here above).
  • the reference electrode is a classic Ag/AgCl reference with KCI electrolyte saturated with AgCl, and in typical operating conditions assures a long term stability of the reference voltage.
  • the reference electrode may also be made of calomel (Hg/Hg 2 Cl 2 ), with saturated KCI electrolyte, for those applications where a very high measurement stability is required.
  • the reference electrode can also be of the following types: Hg/HgSO 4 , Hg/HgO, Hg/ThCl in order to well suit many different application needs.
  • the three electrodes, W, C and R and the temperature sensor are installed into the electrode holder (cell).
  • the main duty of the cell is to keep constant the sample flow rate and the sample velocity inside the electrodes chamber [Fig.1(M) and Fig.2 (F)], regardless the sample flow rate and pressure at the inlet of the cell itself.
  • Cables for the connection of each electrode and of the temperature sensor to the electronic unit are coaxial shielded type, so minimizing electro-magnetic interferences on the signal transmission; this allows to position the cell at variable distances form the electronic unit, from few cm up to several meters, without interferences nor ground noise on the signal. [Fig.1(N) and Fig.2 (G)].
  • the electronic unit (transmitter) [Fig.1(L) and Fig.2 (E)] basically includes the following functionalities:
  • Typical application of the on-line electrochemical analyser for selective chlorite measurements is in drinking water plants, to monitor chlorites concentrations in the various stages of the treatment:

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
EP05425459A 2005-06-27 2005-06-27 Elektrochemische Analysevorrichtung zur selektiven Messung von Chloriten in Wasser Withdrawn EP1739421A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05425459A EP1739421A1 (de) 2005-06-27 2005-06-27 Elektrochemische Analysevorrichtung zur selektiven Messung von Chloriten in Wasser

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05425459A EP1739421A1 (de) 2005-06-27 2005-06-27 Elektrochemische Analysevorrichtung zur selektiven Messung von Chloriten in Wasser

Publications (1)

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EP1739421A1 true EP1739421A1 (de) 2007-01-03

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EP05425459A Withdrawn EP1739421A1 (de) 2005-06-27 2005-06-27 Elektrochemische Analysevorrichtung zur selektiven Messung von Chloriten in Wasser

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008050092A1 (de) * 2008-10-06 2010-04-08 Hach Lange Gmbh Mobile Wasser-Analyseanordnung
FR2960971A1 (fr) * 2010-06-04 2011-12-09 Otv Sa Dispositif de mesure de la valeur d'au moins un parametre representatif de la qualite d'une eau
EP2530055A1 (de) * 2011-06-03 2012-12-05 Siemens Aktiengesellschaft System und Verfahren zur Steuerung der Dosierung eines Desinfektionsmittel in Wasser

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3437445A1 (de) * 1984-10-12 1986-05-07 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Verfahren und einrichtung zur kompensation der temperaturabhaengigkeit einer elektrochemischen messzelle
US4701252A (en) * 1982-06-16 1987-10-20 Matsushita Electric Industrial Co., Ltd. Dissolved gas and ion measuring electrode system
US4772375A (en) * 1986-09-25 1988-09-20 James R. Dartez Antifouling electrochemical gas sensor
JPH02296145A (ja) * 1989-05-10 1990-12-06 Toa Denpa Kogyo Kk 亜塩素酸イオンの測定方法
JPH06222036A (ja) * 1993-01-22 1994-08-12 Toshiba Corp イオン濃度測定用電極の洗浄装置
US20040118680A1 (en) * 2002-12-20 2004-06-24 Robertson Peter M. Electrode assembly and method of using the same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4701252A (en) * 1982-06-16 1987-10-20 Matsushita Electric Industrial Co., Ltd. Dissolved gas and ion measuring electrode system
DE3437445A1 (de) * 1984-10-12 1986-05-07 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Verfahren und einrichtung zur kompensation der temperaturabhaengigkeit einer elektrochemischen messzelle
US4772375A (en) * 1986-09-25 1988-09-20 James R. Dartez Antifouling electrochemical gas sensor
JPH02296145A (ja) * 1989-05-10 1990-12-06 Toa Denpa Kogyo Kk 亜塩素酸イオンの測定方法
JPH06222036A (ja) * 1993-01-22 1994-08-12 Toshiba Corp イオン濃度測定用電極の洗浄装置
US20040118680A1 (en) * 2002-12-20 2004-06-24 Robertson Peter M. Electrode assembly and method of using the same

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DENIS M ET AL: "CONTINUOUS DETERMINATION OF RESIDUAL CHLORITE IN WATER", ANALYTICA CHIMICA ACTA, ELSEVIER, AMSTERDAM, NL, vol. 226, no. 1, 1989, pages 121 - 128, XP009036990, ISSN: 0003-2670 *
PATENT ABSTRACTS OF JAPAN vol. 015, no. 079 (P - 1170) 25 February 1991 (1991-02-25) *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 596 (P - 1825) 14 November 1994 (1994-11-14) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008050092A1 (de) * 2008-10-06 2010-04-08 Hach Lange Gmbh Mobile Wasser-Analyseanordnung
FR2960971A1 (fr) * 2010-06-04 2011-12-09 Otv Sa Dispositif de mesure de la valeur d'au moins un parametre representatif de la qualite d'une eau
WO2011151467A3 (fr) * 2010-06-04 2012-09-13 Veolia Water Solutions & Technologies Support Installation de distribution d'eau comprenant un dispositif de mesure de la valeur d'au moins un paramètre représentatif de la qualité d'une eau
CN103026226A (zh) * 2010-06-04 2013-04-03 威立雅水务解决方案与技术支持公司 包括用于测量代表水质量的至少一参数的值的测量装置的配水设备
EP2530055A1 (de) * 2011-06-03 2012-12-05 Siemens Aktiengesellschaft System und Verfahren zur Steuerung der Dosierung eines Desinfektionsmittel in Wasser
WO2012163640A1 (en) * 2011-06-03 2012-12-06 Siemens Aktiengesellschaft System and method of controlling dosing of a disinfectant into water

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